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This is required on NetNSD and OpenBSD so as multiple sockets can be bound
to in6addr_any and dhcp server port.

Also, fixed selection of the unicast addresses for receiving DHCP packets.

Also, added better documentation for the IfaceCfg class.

Removed the IfaceMgr.detectIfaces_linux test as it is covered in the
IfaceMgr.detectIfaces test already.

The original version of this test incorrectly matched the names of the
interfaces detected by the IfaceMgr and those detected by the unit test.
As a result, the interfaces with similar names (e.g. virbr0 and virbr0-nic)
where compared for the equality of indexes, addresses and flags.

This was noticed by wlodek.
The docbook source was not added to the DOCBOOK list, but
the master file brings it in.
This breaks the document generation from the tarball (which was
missing the file).

I didn't get it reviewed, but I tested it and it is a one-line
trivial change.

Note that my distcheck automated builder has document generation
not enabled so this was not seen. We need to make sure the
document generation is automated using a "dist" tarball.
(My other automated document generation is from the git repo.)

handled conflicts (keactl to keactrl)

Conflicts:
	doc/guide/ddns.xml

discussed on jabber

Various fixes are applied as a result of reading the whole document up to
the section about the DHCPv4 server configuration.

It was failing on a few different systems.
Okay to disable via jabber.
The ticket is #3510.

use two tabs before the committer username.
too long lines fixed

not reviewed, trivial

Conflicts:
	ChangeLog

and not current.

Also mention ISC is the maintainer.

 - Daemon::getVersion() added
 - exists => exits in docs
 - fixed comment in dhcp_test_lib.sh.in